Turkey banned Cem Koksal, former chief executive of Zorlu Holding, from traveling abroad amid an investigation into an internal email discussing corporate recognition of the Islamic holy month of Ramadan, state-run Anadolu Agency reported.

An Istanbul court released Koksal, who was detained late Saturday for interrogation by the city’s Chief Public Prosecutor’s Office, but slapped the travel ban. Prosecutors have blamed Koksal of preventing employees from “exercising freedom of belief, thought, and opinion” during Ramadan, Anadolu said.

The authenticity of the email, images of which have circulated on social media, could not be independently verified.

— Bloomberg